I wanted to wait awhile before I wrote my review to make sure the air purifier would hold up because I’ve had others either quit working or not work as well. I’ve had it for awhile now and it’s still the best air purifier I’ve ever owned. I have extremely bad allergies that medication doesn’t fix. I need more and this does it. It takes the pollen and whatever other contaminants out of the air. For the first time in years I’m going through allergy season healthy and I owe it all to this air purifier.